When adding copyright information it is generally a good idea to render the copyright year dynamically. This can be done in many ways, here are 2 most common:

1st way

© 2012. – 2013.

© 2012. - 

2nd way

© 2012. – 2013.

© 

The second way is better when building new websites, since the output will automatically change next year from © 2013. to © 2013. – 2014. if $copyYear is set to 2013.

©